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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '659aa304d5dc47607cfd66e8f5f0dae4864ee4ab73131814d3a0a20d6bafb2a0' 
  AND token = '7XGg8vIycbv2wbhTEKy4tc1Vbc1du76UQOQ8LJWlMl8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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