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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09bba9fb1fd238e9feec4e32b6be75ea2f3507338132ae00cf8c91f67ed02003' 
  AND token = '7HF5QUX7bJ9kpR26uo9YKRpuIfx+S1S+MbPr2TGByXI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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