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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af8f4850c45764172d2821270d26f3466786189976621a782f22beaa65137b77' 
  AND token = 'N9M4MWRYmX7gKjr4TWLOd+MD7o7tVFyvKa8P7uyhjWQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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