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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0e2cd9b3d49ec1efc4b1b474eb7289a6adb9f47379069cd0b02567bed3e8c74' 
  AND token = 'BkPIch6/lGxU7jOFAfTbmshopyPQhLIKattbGSXDgP4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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