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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e83f455f0c60c50c62002e79d5225a8a4671fdfd887b83ea22661e62c60a15da' 
  AND token = 'zR64dHkC60c8J6HSmNcNiOwo8aCcMi3Mlhd4oRLlD+E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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