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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4f0db26f50f6684dcbc02239cadcb0e8b85472ef9c1827d18d412099c8e70c5' 
  AND token = 'B8zwiAFOmkALNYl+oZL88/fu+CGaxzHi6HyGMB7JkeQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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