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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d8af39f17cc008779a2208ece5d01cda040f614761defb5d78ee5e967eb49c5' 
  AND token = 'Km7sHW3ZyyRm+/564loEdSUxP1YSzO+ZVNFlZhsPPwc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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