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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfd9f72abe607757679e4ffd9d6ae330e305ec17e25e72b0d4b5a0c8a50c83ea' 
  AND token = '1V0G6SSnPapRib5JeLSaARUL70A+N4n4xMRsevCFFcY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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