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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a3220f8285b6b397ad8a4500277acd8014e9e133869d40dab6541d6a8ec05e9' 
  AND token = 'ZraWO2SKvsrNF83ar9KS5XXuJ8Vtr+4wxafkBFGEtoM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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