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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e383c1da93c3c2f3e03186c6c147f9ae1f82d953bf9b3b812a816b0473dbbcf7' 
  AND token = '1LMmwx9XPr/xkYK4Gcjzivb3SLzuKbvk97YRFY3O4zg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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