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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a32c833baf9cea71dc8213b8f728622e14f63e0b3326181d210f01d041d0066' 
  AND token = 'MgTTQxehKeNaEHE6xEAhXW5ZQWOORnLG4KrlUmMuvxc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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