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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2694438d374d652dc6848c928ad8622dba8ce014512c4fa98c19341cc9ded933' 
  AND token = 'cnVEcg6ZjW8+xDb4aizZoXOMEi0rS2VVPrN2udlcfFA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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