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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'adce37e412e32f04b56cafd50ce50bd130a57708dbb3930474ee044287acca2a' 
  AND token = 'W5d1hm4gCzCI/dkdd7dCTEBSB24zIx/JcDDofcM8OmE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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