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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8ff5e6760d7f6f0c15c3a0b5d9df0f94c34de9f4f14830a44737f7b2edc1f3b' 
  AND token = 'eAEtF5CRj4CYMCcVPU4wiyEfCirfbaxLi57KagzDN9k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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