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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab6f2a11343baedd6f517e0a01c4226a806e6754daf49a7a52778e801af475da' 
  AND token = '0wMYYN6q9fCGpzhugEbFD1FfvE+Wf6DieyfOVFW7UKE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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