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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50c88a3875911dec4a4191d986c24d5e677fd2ceb3f7f8567f50ccc40dac375e' 
  AND token = 'zc7eXrVjN8iv+xy32nwWG7zOCMzEwZtijkZPclIHX38=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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