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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4373f40d986b6dbf786725a16ae9f7a90ba46fe6c9c3ce301679e94d6e6ca923' 
  AND token = 'LByb0bv/pnVB28tIcuHVzDSPBFHWFpby9N+LS67R9rI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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