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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90704644e36e1c9b4be33f87febefaa2aae623ce26bb11d5ae38e04e8e0ffde7' 
  AND token = 'M+5pCFBqUsacSJsc/9p04ERIEXT6RPozUo3p+VV0eRw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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