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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc30164ce0890ac5e32fbb917edd7cdb3be731ba15947b8d197b97b21d97f12f' 
  AND token = 'eZHoawpQ7tNYS+T/0b1c27wOaYgkHtfkm6FQZntHScg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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