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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8944ef64ba2ac2cf20b5b49a1f3eeb3804dd45fb76637e05a7386ed28191f33d' 
  AND token = 'O7tNAEyrSC+n8wHral/PMXH0m3BqTvRXlF1ncm6NiA8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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