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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ecd354d5b821e4685652566449d2d52ae8bb535e38d40978306297fd101667c' 
  AND token = '03CsAoFqI3vEw7p3xC6PmOAOPxGNWy4GaOaKSxDIH8w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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