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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32266d8c339af09f7cc1c036dd85bfc405a5d02f17b8ac8a7ac995e40fccba9b' 
  AND token = '9kjFvfn6qYPSnMPqaKN4e7RSNm7XNdokubRDgDRpVS0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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