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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'edc95c9ed85666cc6d727185d0e15b7df1212ad1dec43f0df996257b94ae5b47' 
  AND token = 't4UbpUFaJSpzxEG8CqylG8NeaXBSFAcJPMvuYELv/VA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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