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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff06d3ac11f2d678cbf52e953bda9a0c908b5261dae419e52d8e2ce01c0afe3a' 
  AND token = 'DCyWWH3W1QmU95T+9O6XbhCzWkAdiu87faNk9unMHP0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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