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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '439cf3e1a62042cb328d1ad387e987adcb7ae66272c061bdbb2d897139ed326e' 
  AND token = '3l5TCT9GEaY7UbH+AHYtqss98zWl63g8Lk23NVJhSO8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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