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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1bcfc052a83ffca61e1d685497f33ff569d883116ce9dcca634e9eeaaa4cc79b' 
  AND token = '/JL4cnXzQ4tzcjdPDFkvg0MMlA9mTsN/MfxVUy5m938=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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