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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0cd7354d5bad88b63ab65a94e65597f4463c2bc4fef993a6b1fb8cf022ca9bad' 
  AND token = 'd7Y7cOvh3pZdsUEEbSJP6WOIb13xHlDnfKIUtlZP+Ws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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