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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3d585fd1401b89f0897a6141bf414e401c99f54cbdf42e30d0269d29ec120aa' 
  AND token = 'IMyN7LUI1F+7XCIwk7xDovJTg2k7yUq2FC9RnMGz+9U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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