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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '418b6eb521cf75448d3b2478488bc8978c74bdf04812dcc58a6c6de394e12b30' 
  AND token = 'c8u9Ekw0gP0HpU+Jc8sk7kfuZHoD2rmfEHR8oUFhUQk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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