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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19f03eea8d3f8efb841713eea53d09c435851facca14dcc283dcb9c273b6bc4c' 
  AND token = '7WfDFMb5NsUk3awr/wY1Hglc6lDy0YMn/S0WVS6r4SE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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