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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '668ce5fa1a4a0a45827ce2c5e12af00a60d956ff196ee3091ccb9e1a92a12997' 
  AND token = 'SopcGkUobK6roA/wRSZ0ILci6OHaSiauCcMPcm86YV8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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