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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f443df510b75d80745b768f35fc13c1b090f9c62dfbdef4fa15204d33779eed1' 
  AND token = 'HKxkJySyxuR30gJTmRu520RFo6Z3cZpyjcZ2JAQLyws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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