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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '624ea4ddf329b3f4218df71340f6e00266f9cc768d3f0ba5acd49c2efb6d88c1' 
  AND token = 'wMPj6nl8c0Y/zLarEk6CovXkvXrAdppk0gUMW4SEfs4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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