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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9678bb5c929ec91b17928cb25199cde26b92ae9dfd7a72a4af857e16772bf4f8' 
  AND token = 'M9jDtkMP0D0Cj8mC9j6kPKs3BdqHxh+9MvREDgwZ3cc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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