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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8e6d832562d4e712dba604025f4b8e72c1a43a9d5c7a2ce58d7ff9235223935' 
  AND token = '4YyTI7JWtJFrR7cX7AqqadAnDsn3k7807gE2eCyW9fc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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