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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '830527e96257912552645a09dde3ff9d39a160f771081eb0c4ab7808587958a4' 
  AND token = 'V/BeCsksjWMg/MUiJ6kOvE/VjXN2LtmC16Rwq77Q5uM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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