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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3c7e5edc712913c44d6636e7a5534d7bd36e29732a493204032e3030a0e0717' 
  AND token = 'aEL2O+tHSqMhlmRgcBvqy7QMMCf0tFzUUmk55yiim1w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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