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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '953209efd48a0e5da84773b0884edeabda4830c07bd920be3fba045c1106add7' 
  AND token = 'M0r74cAgbT2+ka5DXnWC3neKPRyVy6aJMPzPPHiPE+o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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