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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31e21cfa7e7670172769a3c4da2d8bfea08e70b7a78b987613bef4151ba14680' 
  AND token = 'lLfY1cLnG5RBSa7DNtH3Z4Je9/eusWu4i29OU58Ybw4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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