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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64cf95df36e970e3ca8040c4a4df8b6a9875d58444ae089217226e9e57aba2a7' 
  AND token = 'CpvrJ3Sj7zL/5uP0f8tG5q1xB32NQLDhQupdYNpDvaU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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