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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc75f4406ef2310ccea7e136d679f463caae6b6d1db1a2366f4a12ef10d067c5' 
  AND token = '0rVFsrOa172gq6OSBeQ1oB0Rpt058Vx5zgc0UmMxaxc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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