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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cfd4b764e8dd0f75d69c37d572598bf6114e15da15844aaedc92e57d7230ba3b' 
  AND token = 'f6bDwWJ7UMHc/mftvvPj1m9iXlQQaWP11vox57ErHAE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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