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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17b5aef822f116444b2bf89b128938be846cb0522593a7067b299702c512be7d' 
  AND token = '5441OjHl02KM/9pbZQ15vsqKRsSiR9NHs1NIdxuxEtU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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