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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57c9bde10a5a88fc26e497308276815f949e3f6d74a0b0927720fbe3987e2254' 
  AND token = 'BG4kCg8/YWOjN48XZL6yya0cEfdNymZMi6+3eA4VHRE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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