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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5bcbb0c4732904499d807b01f51003584e7386d0a525348fc2e2c4fbd5d89456' 
  AND token = 'sZvkVj5bc76KrYrklfVGRfGBW/LyllAfEVjcoG7b+zc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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