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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb7c96d9ebed49c31c9420ff3e3f8b748b4a5ec43f72b32bd180f3172a582b6b' 
  AND token = 'fvvkOhc5uNT20WVewqzR+yGds5umNer8CcaAM3qQKXc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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