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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a389a4c0f0e05f1d76b2d27488c8a9ded04987eac7283750e1e086a8ed79a9d' 
  AND token = 'qrg1ozRAFbxFzmME4jngF+HTDbppSVYbMBkY0Focvhs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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