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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ee43196a4a0336be98d08b4c8f4d0537a302fd7c33e4c863f432b757baf55e0' 
  AND token = 'vZ7jbmbp8zShKBIbmnAMWIXtiO6u3Ammu6djJCONtn4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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