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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd14f1076989e2c2a271de644f57ffd610c2f0df654e5a3570a0db8782a7c05ee' 
  AND token = '9Gb+N4tdsh/JfdUJmaquR1ELJgNGZ28nSRHNqRQBTf8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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