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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1439e7327baaacdb7eb617402758a4150314d1a8483761359a33098e47ff8f6' 
  AND token = 'n68P0bJEjGdA1vNEmN7eKO6y36BKFq4XZjRaO6KN+/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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