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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88ca91c596e6a7876e0e4f7b5fbc6f67af10aace4990e706b90974aec6be235c' 
  AND token = '2qedRfZVsqgTpFQ6iqkpBehVpvOF/wxoh9MhMeEkZ9I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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