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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '981d9a7fec64c57a60052c5e8dd4af1fcf9fc2e7e784b9d9d59d113d3191fc72' 
  AND token = 'HWLdRwDfSeksDUfz44bEGM7k6Bem1bKXtr1ejTMbJEk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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