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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd80528534d87053b75556336a5d291281e2935cda6d2027d27347cf9c1db3cd3' 
  AND token = 'mfsHeFCfuM/ue7kgq21Ies+TiJTJCtoSNIWQRyBOYC0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}