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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90eac5b8310ecca36f389dd64f03485e76c53c374293686652d7a792c250e25d' 
  AND token = '75Wz+1F2Q2yyBAAoOYW9W4jrxWxZCGsWkOA3Fk4CHmg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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