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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd41d974610a0dcd8a927c3724e57a7efde6b9ea0b3e0b1709b5d8e83b649ea26' 
  AND token = 'vPrcObEmF9a1Qtx3zAGkYR9DUHm35mv0hDzNN/4JTk0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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