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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41bdd12987136e36e62e148a17a8d9617a2609b6330b7a764006bc9719362fbb' 
  AND token = 'k+GACH+WQEWJCU3mhOveUPAGO7rwVzC71SoZ46p8JkA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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