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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b12e6aeed9775f638d48e092a0552554234c8881ce99fb3f7b33e6efe66724d' 
  AND token = 'M/J4Lpk4F4gKP4vUGxYE3xzh3zBalFPToiQFtrEtayI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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