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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '137824f8cb1bd88a04a073b570544eb975022839d73db98cbd4d78f34f0fb8c3' 
  AND token = 'VOAXNUf0/PzFPnHIKbkR4ffnMaC15NDdwBQgN0kSbus=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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