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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99b96dc5c4dc9d86f538b798adb90cdde4d8c6b260e4a3f4635062e1ef8168d6' 
  AND token = '/C+uQJaOC0KHkmJHZpoVBT7WKxcsAE4NxRxT8OeKxgc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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