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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fca95bff1469add3ef9cd816a03205bedf61635b7d82946ab5ba4e15a41ef128' 
  AND token = 'Sls64QwyBwNOKSVyf29kAzaqCycBYX7v8vW1Rqtxar4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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