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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1b0b01efe6c1fe56c51eed3b90c6fbe397b9063eee6d21226aa230e3bcec365' 
  AND token = 'ATSsKx6VBX+INXJZUVZ5Rd3qS815gAMf5kWkqGXuGlY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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