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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0c371f7c44871f4c4979dd40d5aa82a7de14e20df52d6cc396dbe8c1e480f65' 
  AND token = 'b4l8vjyUkCk/J7sPSr9c1Lbsn58r96heLqvMBgjNG90=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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