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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4846cb73664d0126465a57b5464d3b55d286e108a53aa0cf37d5edaafeee849b' 
  AND token = '7XStG9KAaf0LrRs9/4gDKP8z0DHri80wHIJ3eTzO1to=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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