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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3c083fbff9b9e0e141f06fb5c8a35518bcc34955aafac146c01b55d24f2ad27' 
  AND token = 'ahKVHq1SkJcDo3aND18YehNkV8sRRNjKw6BvEcPT2B8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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