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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44f2088812c44690120fd1e4b877bf5c98992b915ebb149e1fba54e2c71bdf0b' 
  AND token = 'qeOgfIPrmVI8K7b/xHW5l0qegBJNWjVbxpDj27Tq/ug=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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