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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97c112b5eb35ab93e81205f57ddef8db6e3cc17241bf3389de5be0653dbe8bb8' 
  AND token = 'f6Vn/jSMrN8APJtQfIB8hUuScwU9n3WvIiriQNm4+M0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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