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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e901c4501c6f9227042a2931f887ec4fbae2e12d72ea9769177d7069eaf7482' 
  AND token = 'gEOwGxM8fktoTtTgQK4zx2MLyjMkoKCZuhKMRC0NaCE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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