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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb7c8d92aaf0315ebd7c0707e0f81ba0d24a36a7b8f5ec91b1e6a3d84f47e80e' 
  AND token = 'Mu3KbjhysBxdcVeewYNoHddsMTRMxBW4HeHVIB2Wl2s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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