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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8f9d5ad88488c1a9ccc8d32d8c2893771ace223e26cb29da6cce79799d9a90c' 
  AND token = 'm5GINjuTwQ2SWz6t7lxD5DujDUxofBqa9a35iYGi+vE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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