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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d3765512cdb8f6b6f1b20218f6104e4ea339e11c309c240b5667c40dcd53625' 
  AND token = 'f3OcFbbSgfr4nawaE+kazPM7g8gzccSBSRsVj7JZk/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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