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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5391e5193ac3c21417cb5e994d72cc107f52c4c548b359f1a5e2d63369ad7c60' 
  AND token = 'Aet5L66isXgsEykbMASYXs7X1Q1MENnjMnmDeFBqgHA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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