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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '65d2a342173f154a5b77ca49435363b74b0372ddcef434b20652c7d91938bb1a' 
  AND token = 'iVcMtSocdR+1ACM17i9Sdbn4jvjLH75HvR95e/Nt7HM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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