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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2fba93e41a45b210360bb1b6f86ce324a31731894e0481e3f9f840d26a8b54ed' 
  AND token = 'Hz1K3rw4FzgPtECaWwvkijXXs91Pd3WNDbGKTU3avgo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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