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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c00eff0a31b6231f24be386b8d7e21181f0f703b22e236c253bcfb21dc63d209' 
  AND token = '6q9tgmzRwIKUlLONepp2lJqt+ejyg/D6WIUB8qzjzAc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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