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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a186869260032ad1c7cd8fa7bbe1a27abfe1488fb3d8b416d681ebc720e432d' 
  AND token = 'CSHP432m2G1QO+Vy9GOAKhJGdhCEVjdwatQzvtq/eyg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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